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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304d63fb42bec14ed8f62221a9aa13a26f9306692e464456c175c9f73999c442' 
  AND token = 'QRovAik1v4CHRMZpshuIhjUity4ngfJMBfMTY/LNa6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}